Telephone repeating system.



C. ADAMS-RANDALL. TELEPHONE REPEATING SYSTEM.

APPLICATION FILED DEC. 20, 1910.

,1- ,OO8,881, I Patented N0v.14,1911.

a system UNITED STATES PATENT enrich CHARLES ADAMS-RANDALL, OF NEW YORK, N. Y., ASSIGNOR '10 RANDALL TELEPHONE MANUFACTURING COMPANY, OF AUGUSTA,

MAINE, A'CORPOBIATION OF MAINE.

T'lill'aEIPI-IONllil REPEATING SYSTEM.

.1 ,ooassi'.

Specification of Letters Patent.

Patented Nov, 1a, 1911.

To all whom'it may concern:

Be it known thatI, CHARLES AnAMs-RAN- DALL, a citizen of the United States, residing at New ,York, in the county of New York and State-of New York, have invented certain new and useful'lmprovements in Telephone Repeating Systems Controlled by Single Relay; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This inventionrelates to electro-magnetic telephone repeating systems and has for its object to produce an apparatus of this nature which will be more efficient and simpler in construction than those heretofore proposed. 4

To these ends the invention consists in a plurality ofindcpcndent sending and receiving main line circuits related to each. other inductively by means of local circuits conand also in conlocal circuits, which circuits are in turn also controlled by said single relay, all as will be more fully hereinafter disclosed andparticularly pointed battery 42.

out in the claims. I

Referring to the accompanying drawings forminga part of this specification in which the figure is a diagrammatic illustration of arranged in accordance with my invention:-1 represents a main line battery; 2 an impedance coil, 3 a receiver, and 4apush button.

Supposing an operator n n eastern station E wishes to talkto an operator at a western station WV, he'would first manually operatethepush button 4 thereby closing contactbetween the lever 5 and the pin 6,- which would permi current 'to flow from the, battery 1 over t 7, receiver 3, wire wire 11, ary 13, wire 16,

8, contact 9, lever 10, lever 5, cont-act 6, wire 12, secondof the induction 'coil 14, wire 15, wire 17 through the coils o fthe main line relay 18;;andwiife 19eback,to the battery 1. The passage,,oi current i through the relay 18 causes its armature 20 160 con-1' tact with the-pin 21 thereby permitting cur rent to flow iromthe .local battery 22 over the wire 23, ,said-v-arma'ture 20 contact 21,

local wire 24, through the-coils of the eastern controller 25, wire 26, and oventhe wire 27 back to the battery 22. The passage of eimpedancefl, the wire station W.

current through the controller 25 closes the contacts 28, 29 and 30.. The operator at the eastern station E now talks intothe transmitter 31 which causes varyingcurrents to pass over the primary 32 of the' induction coil 14 and back to the battery 33. These currents induce similar currents in the secondary 13 of said coil 14 whichmay be supposed to leave one end of said coil over the wire 12, contact 6, lever 5, wire 11, lever 10, contact 9, wire 8, through the receiver 3, wire 7, and wire 34 into the-condenser 35. Similar currents will thereupon flow out of said condenser 35 over the eastern main line sending circuit 36 through the coils of the eastern repeater 37, eastern main line wire 38, armature 39 of the eastern controller 25, across the contact 29, wire 40, and wire 15' back to the other end of said secondary '13.

current from the local battery 42 to pass over the local wire 43 across the contact 30, local wire 44 through the primary 45 of the eastern induction coil 46, wire 47, across the contacts 48, and 49, of the eastern re- The passage of currents through the eastern repeater 37 will'permit peater 37 and over'the wire 50 back to the The passage of currents through the-primary 45 of theeastern induction coil 46 causes similar currents to be induced in the secondary 51 of said induction coil which may be supposed to leave one end of said coil over the western main line receiving circuit 52, wire 53, and into the con-- denser 54. Similar currents pass out of said condenser 54 across the contact 55 at the station W along the lever '56, wire 57, lever 58, contact 59, wire=60, receiver 61, Wire 62, contact 28 at the eastern controller 25,,and over the wire 63 back to the other end of said secondary 51. The'passage ofthese last named currents through the re-- ceiver 61 of course, reproduces the original speech sent out. from the'station-E at the Now, supposing it is desired totransmit speechvfrom the western station W to'the eastern station E, of course in such event the button 4 at E would be retracted through the operation of the. spring 65 andkcontact would be-made between the lever 5 and. the

P n. battery "1 through said lever 5 and the contact 6. The breaking of this? main battery circuit of course, deenergizes the main relay thereby breaking circuit from the of current through the coils of the controller- 70 closes the contacts 72, 73 and 74. The breaking of the main line circuit at the contacts 5 and 6 also deenergizes the eastern controller, 25, and thereupon breaks circuit at the contacts 28, 29 and 30. The operator at the westernstation W now presses. 1n the push button 75 thus closing circuit between .the leve'r 56 and the. contact 76. At the same time, he talks intov the transmitter 77 and.

causes currents from the battery 78 to .trava the condenser 35.

erse the primary 79 of the induction coil 80, which in turn causes induced currents to leave one'end of the secondary 81 over the wire 82,- contact 76, lever 56, wire 57, lever 58, wire 60, receiver 61, western main line wire 62, wire 83, contact 73, armature 84, associated with the western controller 70, western main line sending circuit wire 85, coils of the western repeater 86, main line sending wire 87, wire 53, and wire 88, back to the other end'ot said secondary. 81. The passage of'current over this western main line sending circuit through the coils of the western,repeater 86 permitscurrent to flow from the local battery 89 over the'localwire 90 through the contact 74, wire 91, through the primary 92 of the western induction coil 93', wire 94, across the contacts 95 and 96 of the western repeater and over the wire 97, back to the battery 89. The passa e of current through the primary 92 in uces currents in the secondary 98 of theinduction coil 93, which maybe supposed to pass'from. one end of said secondary over the eastern main line receivin wire 99, wire 36, into imilar currents flow out of said condenser 35 over the wire 34, wire 7, through the receiver 3, at the eastern station E over the connections 8, 9, 10, 11, 5 and 66 into the condenser '100 out of said condenser overthe wire 15, wire. 16, wire 101 across the contact 72, and ,over the wire 102 back to the other end of the said secondary 98. The passage of currents through the receiver 3, of course, reproducesv the. speech originally sent out from the station W.

It willthus be seen that in this invention,

' I have provided a singlemain line battery 1, a single relay 1 8, in a main line circuit fed from said battery, and controlled by the [push button 4.- I also have provided a main controller 25. r

- a main line-1 receiving circuit includmg-the line sending circuit including the. condenser 3 5, the repeater 37 and the contact 29 of the Further, I there is disclosed condenser54, independent of themain line sending circu'itybut adapted to receive messages from the sending circuit through a local circuit fed from the battery 42' and controlled by' the repeater 37. This receiving circuit includes the coil 51, the wire 53, the

condenser 54, the Western receiver 61, and

the contact 28 of the controller 25. It will alsobe observed that the controller 25 is in a local circuit controlled by the relay .18, and that the receiving circuit has associated therewith a controller which is energized,

however, only when said receiving circuit is being employed as a sending circuit. This controller 70 is likewise governed by the single relay '18. Said receiving circuit also has associated therewith a repeater 85 which is also energized when said receiving cirvcuit is'being employed as a sending circuit.

Associated with said receiving circuit is 1 likewise a local circuit fed from thebattery 89 and governed by the controller 7 O, which local circuit has an inductive relation to the eastern main line circuit when it is employed as a receiving circuit. This case differs from my other copending application No. 598,343 filed December 20, 1910 and entitled Telephone "repeating systems among other things, in that said copending application employs a relay in'a local circuit. instead of in the main circuit as does the present case, and in that the controller'19 ofs'aid copending'application governs at its back stop 78 a local'circuit through its relay 82, while departing'from the spirit of my invention,

and, therefore, I do not wish to be limited to the arrangements shown, except as may be required by the claims. I

--What I claim is p 1. In'a telephone repeating system the combination of a main line sending circuit;

a main line receiving circuit independent of saidsending circuit; local circuits in inductive relation at different times with said receiving and sending circuits;-repeaters in said main line CiICllltSj controllers at difi'erent times governing said circuits and a sin gle relay in a main line'circuit governing said controllers, substantially as described.

2. 'In a telephone repeating system, the combination of a main line sending circuit provided with a condenser; a main line receiving clrcuit independent of said sendlng circuit and also provided witha condenser;

local circuits inductively associated at difierent times with said main line circuits; repeaters controlling said local circuits; controllers governing said main linecircuits; and 'a' single relay governing said controllers, substantiallyas described. v

3; In a telephone repeating system, the combination of a main line sending circuit provided with a condenser; a main line receiving circuit independent of said sending circuit and also rovided with a condenser; local circuits in uctively associated at difjt'erent times with. said main line circuits;

repeaters in said main line circuits control-- circuit fed from said battery governing said controllers, substantially as described.

In testiinony whereof, I aifix my signature, in presence of two Witnesses.

CHARLES ADAMS-RANDALL. Witnesses:

FREDERICK B. BLAGKMAN, JOHN J CARROLL.

Copies 0! this patent maybe obtained for flve cents each, by addressing the commissioner of Patents,

' Washington, D. G." r 

